A 9mW direct RF sampling GPS receiver front-end in 0.13&amp;#x00B5;m BiCMOS

Barth, Carsten; Linscott, I. R.; Inan, U. S.

doi:10.1109/iscas.2012.6271473

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…As a result, coherent digital receivers realize satisfactory levels of dynamic range using even simple monobit ADCs and/or sub-Nyquist sampling (subsampling). Modern examples of monobit receivers range from narrowband applications including pulsed radar [3]- [6], the global positioning system (GPS) [2], [7], and low-power communications [8]- [10] to ultrawideband communications [11]. Monobit sampling schemes likewise range widely from oversampling [11] down to extreme ratios of subsampling [3].…”

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confidence: 99%

Delta Modulation Technique for Improving the Sensitivity of Monobit Subsamplers in Radar and Coherent Receiver Applications

Rodenbeck

Tracey

Barkley

et al. 2014

IEEE Trans. Microwave Theory Techn.

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This paper introduces a technique for improving the sensitivity of RF subsamplers in radar and coherent receiver applications. The technique, referred to herein as "delta modulation" (DM), feeds the time-average output of a monobit analog-to-digital converter (ADC) back to the ADC input, but with opposite polarity. Assuming pseudostationary modulation statistics on the sampled RF waveform, the feedback signal corrects for aggregate dc offsets present in the ADC that otherwise degrade ADC sensitivity. Two RF integrated circuits (RFICs) are designed to demonstrate the approach. One uses analog DM to create the feedback signal; the other uses digital DM to achieve the same result. A series of tests validates the designs. The dynamic time-domain response confirms the feedback loop's basic operation. Measured output quantization imbalance, under noise-only input drive, significantly improves with the use of the DM circuit, even for large, deliberately induced dc offsets and wide temperature variation from 55 C to 85 C. Examination of the corrected versus uncorrected baseband spectrum under swept input signal-to-noise ratio (SNR) conditions demonstrates the effectiveness of this approach for realistic radar and coherent receiver applications. Two-tone testing shows no impact of the DM technique on ADC linearity.

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confidence: 99%

Delta Modulation Technique for Improving the Sensitivity of Monobit Subsamplers in Radar and Coherent Receiver Applications

Rodenbeck

Tracey

Barkley

et al. 2014

IEEE Trans. Microwave Theory Techn.

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Advanced RF Front-End Design Issues

Perez

Detratti²

2014

GALILEO Positioning Technology

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When Less Is More$\ldots$ Few Bit ADCs in RF Systems

Rodenbeck¹,

Martinez

Beun³

et al. 2019

IEEE Access

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Digitizing RF signals using few bit ADCs can provide system advantages in terms of reduced power dissipation, wider sampling bandwidth, and decreased demand for digital throughput. The diversity of established applications based on few bit ADCs, together with the recent surge of interest in the topic for 5G wireless communications and millimeter-wave radar, has created a need for practical design guidance governing their use in general RF systems. This paper, therefore, summarizes the state-of-the-art in few bit ADCs, comparing the dynamic range considerations involved with those of conventional RF receiver design. A simple analytic model for the monobit ADC is extended to multiple bits. Parametric analysis, independent of sampling considerations and system-specific signal processing, is used to illustrate the variation in the ADC output signal-to-noise-and-distortion ratio (SNDR) versus both the number of quantization bits and the input signal-to-noise ratio (SNR). At low and negative input SNR, increasing ADC resolution beyond 3-4 bits yields little advantage in output SNDR. Experiment confirms analytic predictions for the specific conditions under which the loss of signal fidelity due to quantization can be made negligible. In addition, parametric analysis of two-tone intermodulation distortion shows clear disadvantages to quantizing with <4 bits in the presence of strong blockers. The results reported in this paper, which are general and independent of system application, can be used to customize the number of ADC bits in an RF system based on system-specific performance requirements for receiver dynamic range. INDEX TERMS Analog-to-digital converters (ADCs), 5G, low resolution ADCs, quantization, coherent receivers, radiofrequency integrated circuits, wireless communications, radar.

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A 9mW direct RF sampling GPS receiver front-end in 0.13µm BiCMOS

Cited by 3 publications

References 5 publications

Delta Modulation Technique for Improving the Sensitivity of Monobit Subsamplers in Radar and Coherent Receiver Applications

Delta Modulation Technique for Improving the Sensitivity of Monobit Subsamplers in Radar and Coherent Receiver Applications

Advanced RF Front-End Design Issues

When Less Is More$\ldots$ Few Bit ADCs in RF Systems

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